<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>爱心抨击</title>
  <style>
    *{
      margin:0;
      padding:0;
    }
    body {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background: #000;
    }
    ul{
      position: relative;
      display: flex;
      height: 200px;
    }
    ul::after{
      content: '爱心怦怦跳';
      position: absolute;
      top: 0;
      left: 50%;
      color: darkturquoise;
      font-size: 30px;
      font-weight: 700;
      transform: translate(-50%, -700%);
    }
    li{
      width: 20px;
      height: 20px;
      border-radius: 10px;
      margin: 0 10px;
    }
    li:nth-child(1){
      background-color: red;
      animation: love1 5s 0s infinite;
    }
    li:nth-child(2){
      background-color: darkturquoise;
      animation: love2 5s .2s infinite;
    }
    li:nth-child(3){
      background-color: darksalmon;
      animation: love3 5s .4s infinite;
    }
    li:nth-child(4){
      background-color: deeppink;
      animation: love4 5s .6s infinite;
    }
    li:nth-child(5){
      background-color: yellow;
      animation: love5 5s .8s infinite;
    }
    li:nth-child(6){
      background-color: deeppink;
      animation: love4 5s 1s infinite;
    }
    li:nth-child(7){
      background-color: darksalmon;
      animation: love3 5s 1.2s infinite;
    }
    li:nth-child(8){
      background-color: darkturquoise;
      animation: love2 5s 1.4s infinite;
    }
    li:nth-child(9){
      background-color: red;
      animation: love1 5s 1.6s infinite;
    }
    /* 下面定义动画 */
    @keyframes love1 {
      30%,50%{
        height: 60px;
        transform: translateY(-30px);
      }
      70%,100%{
        height: 20px;
        transform: translateY(0);
      }
    }
    @keyframes love2 {
      30%,50%{
        height: 125px;
        transform: translateY(-60px);
      }
      70%,100%{
        height: 20px;
        transform: translateY(0);
      }
    }
    @keyframes love3 {
      30%,50%{
        height: 160px;
        transform: translateY(-75px);
      }
      70%,100%{
        height: 20px;
        transform: translateY(0);
      }
    }
    @keyframes love4 {
      30%,50%{
        height: 180px;
        transform: translateY(-60px);
      }
      70%,100%{
        height: 20px;
        transform: translateY(0);
      }
    }
    @keyframes love5 {
      30%,50%{
        height: 200px;
        transform: translateY(-45px);
      }
      70%,100%{
        height: 20px;
        transform: translateY(0);
      }
    }
  </style>
</head>

<body>
  <ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</body>
</html>
